<template>
    <div class="upload-container">
        <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">
            upload
        </el-button>
        <el-dialog :visible.sync="dialogVisible">
            <el-upload
                :multiple="true"
                :file-list="fileList"
                :show-file-list="true"
                :on-remove="handleRemove"
                :on-success="handleSuccess"
                :before-upload="beforeUpload"
                class="editor-slide-upload"
                action="https://httpbin.org/post"
                list-type="picture-card"
            >
                <el-button size="small" type="primary">
                    Click upload
                </el-button>
            </el-upload>
            <el-button @click="dialogVisible = false">
                Cancel
            </el-button>
            <el-button type="primary" @click="handleSubmit">
                Confirm
            </el-button>
        </el-dialog>
    </div>
</template>

<script>
// import { getToken } from 'api/qiniu'

export default {
    name: "EditorSlideUpload",
    props: {
        color: {
            type: String,
            default: "#1890ff"
        }
    },
    data() {
        return {
            dialogVisible: false,
            listObj: {},
            fileList: []
        };
    },
    methods: {
        checkAllSuccess() {
            return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess);
        },
        handleSubmit() {
            const arr = Object.keys(this.listObj).map(v => this.listObj[v]);
            if (!this.checkAllSuccess()) {
                this.$message("Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!");
                return;
            }
            this.$emit("successCBK", arr);
            this.listObj = {};
            this.fileList = [];
            this.dialogVisible = false;
        },
        handleSuccess(response, file) {
            const uid = file.uid;
            const objKeyArr = Object.keys(this.listObj);
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    this.listObj[objKeyArr[i]].url = response.files.file;
                    this.listObj[objKeyArr[i]].hasSuccess = true;
                    return;
                }
            }
        },
        handleRemove(file) {
            const uid = file.uid;
            const objKeyArr = Object.keys(this.listObj);
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    delete this.listObj[objKeyArr[i]];
                    return;
                }
            }
        },
        beforeUpload(file) {
            const _self = this;
            const _URL = window.URL || window.webkitURL;
            const fileName = file.uid;
            this.listObj[fileName] = {};
            return new Promise((resolve, reject) => {
                const img = new Image();
                img.src = _URL.createObjectURL(file);
                img.onload = function() {
                    _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height };
                };
                resolve(true);
            });
        }
    }
};
</script>

<style lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  ::v-deep .el-upload--picture-card {
    width: 100%;
  }
}
</style>
